This Part Fits the following kits / parts:

#102522 - HEAVY DUTY SERVO SAVER SPRING 21x12x1.9mm 4.5COILS

SAVAGE FLUX HP/SAVAGE X & XL/More direct steering

This new heavy-duty servo saver spring provides more direct
steering for all Savage X and Savage Flux models, allowing today's
stronger steering servos to give the Savage models faster and more
immediate steering response. Easy to install for an easy and
effective option! Option part for #86319 and #87197.